Year scale 1-100 1970 50 1971 50 1972 50 1973 50 1974 50 1975 50 1976 50 1977 50 1978 50 1979 50 1980 50 1981 50 1982 50 1983 50 1984 50 1985 66.25 1986 66.25 1987 66.25 1988 66.25 1989 66.25 1990 66.25 1991 66.25 1992 63.125 1993 63.125 1994 65.625 1995 65.625 1996 68.75 1997 77.5 1998 77.5 1999 80.625 2000 80.625 2001 80.625 2002 80.625 2003 86.875 2004 86.875 2005 86.875 2006 86.875 2007 90 2008 90 2009 90 2010 92.5 2011 92.5 2012 92.5 2013 92.5 2014 92.5 2015 92.5 2016 95 2017 95 2018 95 2019 95 2020 95 2021 95 2022 95 2023 95